Ortho-oxymonoazo dye.



UNITED STATES PATENT OFFICE.

KARL SCHIRMACHER AND FRIEDRICH SCHMIDT, OF HOCHST-ON-THE- MAIN, GERMANY, ASSIGNORS TO FARBWERKE, VORM. MEISTER, LUCIUS & BRUNING, OF H( )CHST-ON-THE-MAIN, GERMANY, A COR- ORTHO-OXYMONOAZO DYE.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed August 4,1905. Serial No. 272,630.

To aZZ whom, it iii/Ly concern.-

Be it known that we, KARL SonIRMAoHER, Ph. D., and FRIEDRICH SCHMIDT, Ph. D., chemists, citizens of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in the Manufacture of Ortho- Oxymonoazo Dyestufis, of which the following is a specification.

We have found that by combining the diazo compound of para-chloro-ortho-amido phenol (OH :NH Cl=1:2 :4) with 1:8 :3 :6

ioXynaphthalene-disulfonic acid (Qo d md g m lowing formula:

' (1) OH OH (8) on 06133 (2) N I C10H3 I SO3Na (4:) Cl 4 (6) SOgNa Example: 14.3 kilograms of chloro-orthoamidophenol are dissolved in water while adding thirty kilograms of hydrochloric acid of about 20 Baum and diazotized with 6.9 kilograms of nitrate. The diazo solution containing partly the separated diazo compound is slowly introduced at ordinary temerature into a solution of thirty eight kilograms of the disodium salt of chromotropic acid C, H (OH), (SO Na) thirty kilograms of finely-divided hydrate of lime having been stirred in. After about six hours the formation of the dyestuif is complete. From the solution the dyestuff may be separated by adding hydrochloric acid and common salt. When dry, it is a dark powder of bronze luster, soluble in water with a bluishred color, which on adding sodium carbonate becomes blue-violet. In concentrated sulfuric acid the dyestufi is soluble with a blue color. It dyes wool in an acid-bath red, which on subsequent treatment with chromine becomes blue. On chrome-mordanted wool the dyestuff yields a beautiful very fast blue. On treating with tin and hydrochloric acid the dyestuif is reduced to chloroamidophenol and amidochromotropic acid.

Having now described our invention, what we claim is As a new product, the ortho-oxymonoazo dyestuff having as sodium salt the following formula:

0 1-1 NJ:N(2)C10H3 ggN (4) (6) SOaNa.

being a dark powder of bronze luster, soluble in water with a bluish-red color, which on adding sodium carbonate becomes blueviolet, while adding dilute hodrochloric acid hardly produces any change in the color; in concentrated sulfuric acid the dyestuif is soluble with a blue color; on reducing with tin and hydrochloricacid the dyestuff is split into para-chloro-amidophenol and amidochromotropic acid; it dyes wool red in an acid-bath; the dyeing of the chrome-lake being blue; p

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

KARL SCHIRMACHER. FRIEDRICH SCHMIDT.

Witnesses: v

ALFRED BRIsBoIs, BERNHARD LEYDEOKER. 

